The innovative and practical wavy design of the Stand Firm wavy acrylic and stainless steel mug, which makes it easy to carry, and the theme verse--1 Corinthians 15:58--paired with the Stand Firm theme will make this one of your favorite mugs. The interior is made of 100-percent stainless steel and it comes with an easy-to-open spill-proof lid. Give it as a gift or keep it for yourself.